This is my first opportunity to write and thank everyone for their patience and help with my serious problem"1% is not a valid win 32 application" In the end I bit the bullet and reformatted my PC with the assistance of Evesham technical help. I deliberately bought an Evesham PC because of their good reputation for assistance. Now I printed off all the helpful instructions on how to rid my PC of nasties and in addition, I have read very carefully BlackSpear's notes on security. I have equipped my PC with many of his suggestions: Apart from Avast 4.6 Home edition AV and Zonealarm Home edition firewall, I have the following: AdAware SE Personal Ewido SpywareBlaster, SpywareGuard Spybot Prevx Home Edition Reg Seeker CCleaner CW Shredder I have not downloaded Proxomitron or any of the Hosts programmes as I am not sure they are easy to use for a non technical person like me. If they would be useful and if you all think they would help me to sat clean, then I will willingly get them. I am considering a back up programme to purchase and any other malware product to catch Trojans, worms, keyloggers etc. Can you recommend which programme is most comprehensive and useful for me to buy? I see that Acronis True Image is highly recommended as a back up tool and if this is suitable for simple folk like me, I will buy it. BTW, I was unable to use the free scanners that are recommended as they are not compatible with Firefox. Are any of them suitable for me? I am determined to try to save myself from the trauma I experienced before I reformatted. I was able to save my address book, but lost many items of music which I had not disced. When I was attacked, Nero and my other burning programmes would not work. I look forward to your excellent advice. PS You wouldn't read about it.... I just had a virus warning from Avast about a nasty that is associated with Trend Micro. I had tried to get the free scan but when it was not possible with FF, I forgot it, until I discovered a file on my desktop called Sysclean.exezz...which I reckoned was od. I right clicked and Avast sounded a warning that it was a virus called Redlof. I put it in the quarantine chest and sent it to Avast. How do these things happen to innocents like me?